Earlier quoted context omitted.
This is the point that RMS is trying to make. His argument (iirc) is that "rape" might be an incorrect word used to describe what happened (was it proved to be rape? The only part proved iirc were the ages), and that immediately because the person was 17 instead of 18, that word is used to describe the situation without second thought. I don't think he was saying that there should be zero repercussions, or that we sh…
What word or phrase would you used to describe sex between an old man and a 17 year-old girl?
This is a silly question, because you're not even bringing jurisdictions into it. In much of the US, this is perfectly legal and is neither rape nor statutory rape.